Bundle: Understanding Motor Controls, 4th + Mindtap Electrical, 2 Terms (12 Months) Printed Access Card
4th Edition
ISBN: 9780357097755
Author: Stephen L. Herman
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 39, Problem 1RQ
Why are NEMA symbols such as push buttons, float switches, or limit switches not used in programmable logic controller schematics?
Expert Solution & Answer
To determine
Identify why the NEMA symbols for components such as push buttons, limit switches and float switches are not used in the schematic of a programmable controller.
Explanation of Solution
The programmable logic controller can only recognise whether a contact is open or closed. It doesn’t know if the contact is connected to components such as float switches, push buttons and so on.
Thus, there is no NEMA symbol used to identify components such as push buttons, limit switches and float switches in the schematic of a programmable controller.
Want to see more full solutions like this?
Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!
Students have asked these similar questions
Three cables are pulling on a ring located at the origin, as shown in the diagram below. FA is 200 N in magnitude with a transverse angle of 30° and an azimuth angle of 140°. FB is 240 N in magnitude with coordinate direction angles α = 135° and β = 45°. Determine the magnitude and direction of FC so that the resultant of all 3 force vectors lies on the z-axis and has a magnitude of 300 N. Specify the direction of FC using its coordinate direction angles.
turbomachienery
auto controls
Chapter 39 Solutions
Bundle: Understanding Motor Controls, 4th + Mindtap Electrical, 2 Terms (12 Months) Printed Access Card
Ch. 39 - Why are NEMA symbols such as push buttons, float...Ch. 39 - Prob. 2RQCh. 39 - Why are normally closed components such as STOP...Ch. 39 - Prob. 4RQCh. 39 - Prob. 5RQCh. 39 - List four basic rules for developing a program for...Ch. 39 - A PLC requires that times be programmed in...Ch. 39 - When programming in Boolean, what statement should...Ch. 39 - When programming in Boolean, what statement should...Ch. 39 - In a control circuit, it is imperative that a coil...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- auto controlsarrow_forward1 Pleasearrow_forwardA spring cylinder system measures the pressure. Determine which spring can measure pressure between 0-1 MPa with a large excursion. The plate has a diameter of 20 mm. Also determine the displacement of each 0.1 MPa step.Spring power F=c x fF=Springpower(N)c=Spring constant (N/mm)f=Suspension (mm) How do I come up with right answer?arrow_forward
- A lift with a counterweight is attached to the ceiling. The attachment is with 6 stainless and oiled screws. What screw size is required? What tightening torque? - The lift weighs 500 kg and can carry 800 kg. - Counterweight weight 600 kg - Durability class 12.8 = 960 MPa- Safety factor ns=5+-Sr/Fm= 0.29Gr =0.55arrow_forwardKnowing that a force P of magnitude 750 N is applied to the pedal shown, determine (a) the diameter of the pin at C for which the average shearing stress in the pin is 40 MPa, (b) the corresponding bearing stress in the pedal at C, (c) the corresponding bearing stress in each support bracket at C. 75 mm 300 mm- mm A B P 125 mm 5 mm C Darrow_forwardAssume the B frame differs from the N frame through a 90 degree rotation about the second N base vector. The corresponding DCM description is: 1 2 3 4 5 6 9 # adjust the return matrix values as needed def result(): dcm = [0, 0, 0, 0, 0, 0, 0, 0, 0] return dcmarrow_forward
- Find the reaction at A and B The other response I got was not too accurate,I need expert solved answer, don't use Artificial intelligence or screen shot it solvingarrow_forwardNo chatgpt plsarrow_forwardSolve for the reaction of all the forces Don't use artificial intelligence or screen shot it, only expert should solvearrow_forward
- No chatgpt plsarrow_forwardA six cylinder petrol engine has a compression ratio of 5:1. The clearance volume of each cylinder is 110CC. It operates on the four-stroke constant volume cycle and the indicated efficiency ratio referred to air standard efficiency is 0.56. At the speed of 2400 rpm. 44000KJ/kg. Determine the consumes 10kg of fuel per hour. The calorific value of fuel average indicated mean effective pressure.arrow_forwardThe members of a truss are connected to the gusset plate as shown in (Figure 1). The forces are concurrent at point O. Take = 90° and T₁ = 7.5 kN. Part A Determine the magnitude of F for equilibrium. Express your answer to three significant figures and include the appropriate units. F= 7.03 Submit ? kN Previous Answers Request Answer × Incorrect; Try Again; 21 attempts remaining ▾ Part B Determine the magnitude of T2 for equilibrium. Express your answer to three significant figures and include the appropriate units. Figure T₂ = 7.03 C T2 |? KN Submit Previous Answers Request Answer × Incorrect; Try Again; 23 attempts remaining Provide Feedbackarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Understanding Motor ControlsMechanical EngineeringISBN:9781337798686Author:Stephen L. HermanPublisher:Delmar Cengage Learning
Precision Machining Technology (MindTap Course Li...Mechanical EngineeringISBN:9781285444543Author:Peter J. Hoffman, Eric S. Hopewell, Brian JanesPublisher:Cengage Learning
Automotive Technology: A Systems Approach (MindTa...Mechanical EngineeringISBN:9781133612315Author:Jack Erjavec, Rob ThompsonPublisher:Cengage Learning
Understanding Motor Controls
Mechanical Engineering
ISBN:9781337798686
Author:Stephen L. Herman
Publisher:Delmar Cengage Learning
Precision Machining Technology (MindTap Course Li...
Mechanical Engineering
ISBN:9781285444543
Author:Peter J. Hoffman, Eric S. Hopewell, Brian Janes
Publisher:Cengage Learning
Automotive Technology: A Systems Approach (MindTa...
Mechanical Engineering
ISBN:9781133612315
Author:Jack Erjavec, Rob Thompson
Publisher:Cengage Learning
The Robot Revolution: The New Age of Manufacturing | Moving Upstream; Author: Wall Street Journal;https://www.youtube.com/watch?v=HX6M4QunVmA;License: Standard Youtube License